Catalytic Neutralization of Water Pollutants Mediated by Dendritic Polymers

Arkas, Michael; Anastopoulos, Ioannis; Giannakoudakis, Dimitrios A.; Pashalidis, Ioannis; Katsika, Theodora; Nikoli, Eleni; Panagiotopoulos, Rafael; Fotopoulou, Anna; Vardavoulias, Michail; Douloudi, Marilina

doi:10.3390/nano12030445

Cited by 16 publications

(8 citation statements)

References 197 publications

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“…The convergent technique gives better control of the preparation of dendritic polymers, thus limiting structural flaws and impurities can be gotten rid of easily, as they conspicuously differ in morphology from the synthesized dendrimers. However, steric congestion is a challenge in the convergent approach, thus they are only suitable for small-scale dendrimers [36][37][38]. In the combination approach, a divergent technique is used to synthesize building blocks, which is then followed by convergent dendrimer assembly.…”

Section: Dendritic Polymersmentioning

confidence: 99%

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

Adeola

Nomngongo

2022

Polymers

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Water pollution remains one of the greatest challenges in the modern era, and water treatment strategies have continually been improved to meet the increasing demand for safe water. In the last few decades, tremendous research has been carried out toward developing selective and efficient polymeric adsorbents and membranes. However, developing non-toxic, biocompatible, cost-effective, and efficient polymeric nanocomposites is still being explored. In polymer nanocomposites, nanofillers and/or nanoparticles are dispersed in polymeric matrices such as dendrimer, cellulose, resins, etc., to improve their mechanical, thermophysical, and physicochemical properties. Several techniques can be used to develop polymer nanocomposites, and the most prevalent methods include mixing, melt-mixing, in-situ polymerization, electrospinning, and selective laser sintering techniques. Emerging technologies for polymer nanocomposite development include selective laser sintering and microwave-assisted techniques, proffering solutions to aggregation challenges and other morphological defects. Available and emerging techniques aim to produce efficient, durable, and cost-effective polymer nanocomposites with uniform dispersion and minimal defects. Polymer nanocomposites are utilized as filtering membranes and adsorbents to remove chemical contaminants from aqueous media. This study covers the synthesis and usage of various polymeric nanocomposites in water treatment, as well as the major criteria that influence their performance, and highlights challenges and considerations for future research.

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Section: Dendritic Polymersmentioning

confidence: 99%

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

Adeola

Nomngongo

2022

Polymers

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“…In recent years, investigations have been focused on the development and production of very effective and selective adsorbents. Such adsorbent materials include, but are not limited to, inorganic solids (metal oxides and minerals) [ 18 ], biomass by-products [ 12 , 13 , 14 , 15 , 19 ], composite materials [ 20 , 21 , 22 , 23 ], polymers [ 24 , 25 ], dendrimers [ 26 ], MOFs [ 27 , 28 , 29 ], carbon-based materials [ 30 ], hybrid materials [ 31 , 32 , 33 ], and biopolymer-based materials [ 34 , 35 , 36 ]. Recently, and more intensively in the last decade, aerogels of various chemical compositions and nanostructures have been tested for uranium adsorption and recovery from wastewater and seawater, sometimes with impressive performances [ 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ,…”

Section: Introductionmentioning

confidence: 99%

Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents—A Critical Review

et al. 2023

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Aerogels are a class of lightweight, nanoporous, and nanostructured materials with diverse chemical compositions and a huge potential for applications in a broad spectrum of fields. This has led the IUPAC to include them in the top ten emerging technologies in chemistry for 2022. This review provides an overview of aerogel-based adsorbents that have been used for the removal and recovery of uranium from aqueous environments, as well as an insight into the physicochemical parameters affecting the adsorption efficiency and mechanism. Uranium removal is of particular interest regarding uranium analysis and recovery, to cover the present and future uranium needs for nuclear power energy production. Among the methods used, such as ion exchange, precipitation, and solvent extraction, adsorption-based technologies are very attractive due to their easy and low-cost implementation, as well as the wide spectrum of adsorbents available. Aerogel-based adsorbents present an extraordinary sorption capacity for hexavalent uranium that can be as high as 8.8 mol kg–1 (2088 g kg–1). The adsorption data generally follow the Langmuir isotherm model, and the kinetic data are in most cases better described by the pseudo-second-order kinetic model. An evaluation of the thermodynamic data reveals that the adsorption is generally an endothermic, entropy-driven process (ΔH0, ΔS0 > 0). Spectroscopic studies (e.g., FTIR and XPS) indicate that the adsorption is based on the formation of inner-sphere complexes between surface active moieties and the uranyl cation. Regeneration and uranium recovery by acidification and complexation using carbonate or chelating ligands (e.g., EDTA) have been found to be successful. The application of aerogel-based adsorbents to uranium removal from industrial processes and uranium-contaminated waste waters was also successful, assuming that these materials could be very attractive as adsorbents in water treatment and uranium recovery technologies. However, the selectivity of the studied materials towards hexavalent uranium is limited, suggesting further developments of aerogel materials that could be modified by surface derivatization with chelating agents (e.g., salophen and iminodiacetate) presenting high selectivity for uranyl moieties.

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“…In parallel to the research on dendritic polymers, the field of bioinspired nanoscience is also rapidly evolving as the need for materials with new and eco-friendly features is increasing. As a consequence, in many cases, the hybrid nanoparticles prepared, involve combinations of dendritic polymers with other materials, for instance, biomineralized metal nanoparticles [23] or biomimetically produced ceramics [24][25][26]. The unique physicochemical properties of these composites have made them ideal tools in everyday applications, such as additives in textiles [27], drug carriers [28], water purification agents [29], and heterogeneous catalysts [30].…”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Antimicrobial Coatings for Medical Leathers from Silica-Dendritic Polymer-Silver Nanoparticle Composite Xerogels

Arkas¹,

Kythreoti²,

Favvas³

et al. 2022

Preprint

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Hybrid organic-inorganic (dendritic polymer-silica) xerogels containing silver nanoparticles (Ag-Nps) were developed as antibacterial leather coatings. The preparation method is environmentally friendly, based on two biomimetic reactions. Silica gelation and spontaneous (Ag-Np) formation were both mediated by hyperbranched poly (ethylene imine) (PEI) scaffolds of variable Mw (2000-750000). The formation of precursor hydrogels was monitored by dynamic light scattering (DLS). The chemical composition of the xerogels was assessed by Infra-Red Spectroscopy (IR) and Energy-dispersive X-ray spectroscopy (EDS) while the uniformity of the coatings was established by scanning electron microscopy (SEM). Release properties of coated leather samples and overall behaviour in water in comparison to untreated analogs were investigated by UV-Vis spectroscopy. Antibacterial activity was tested towards Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus, and antibiofilm properties against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Acinetobacter baumannii, Enterococcus faecalis while SARS-Cov-2 clinical isolate was employed for the first estimation of their antiviral potential. Toxicity was evaluated using the Jurkat E6.1-cell line. Finally, water contact angle measurements were implemented to determine the enhancement of the leather surface hydrophilicity caused by these composite layers. The final advanced products are intended for use in medical applications.

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Catalytic Neutralization of Water Pollutants Mediated by Dendritic Polymers

Cited by 16 publications

References 197 publications

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

Advanced Polymeric Nanocomposites for Water Treatment Applications: A Holistic Perspective

Uranium Removal from Aqueous Solutions by Aerogel-Based Adsorbents—A Critical Review

Hydrophilic Antimicrobial Coatings for Medical Leathers from Silica-Dendritic Polymer-Silver Nanoparticle Composite Xerogels

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